<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			div{
				width: 400px;
				height: 100px;
				background-color: orange;
				font-weight: bold;
				color: #FFF;
			}
			div:hover{
				width: 700px;
				-webkit-transition-property: width;
				-moz-transition-property: width;
			}
		</style>
	</head>
	<body>
		<div>使用transition-property属性改变元素宽度</div>
	</body>
</html>
